C.E. Niehoff & Co. A3-201 Regulator Installation

C. E. Niehoff & Co

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BRUSHLESS ALTERNATORS

A3-201 Adjustable

Dual Pulley

Installation Instructions

No. Description
A Spacer
B Bolt – 4 req'd
C Hub
D Pulley Sheave – 3 req'd
E Backing Plate
F Rear Pulley Sheave
G Lock Washer – 4 req'd
H Key
J Retaining Ring

DO NOT REMOVE RET AINING RING

REMOVE SCREWS TO DISASSEMBLE

1. Determine belt size by measuring across belt.

2. Determine number of spacers to be used
between pulley faces from following chart:

Bolt on Fan

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BEL T SIZE

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Belt Size 3/8 7/16 1/2 9/16 5/8 11/16 3/4 13/16 7/8 15/16 1 1-1/16
No. of

Spacers 012345666666

1 more or 1 less spacer than number shown in chart can usually be used if desired.

3. Determine belt spacing by measuring old pulley as shown.

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MEASURE FROM INSIDE SURFACE TO
CORRESPONDING INSIDE SURFACE
OR CENTERLINE TO CENTERLINE.

4. Determine the amount of spacers required for proper belt spacing from the chart on the back of this
instruction sheet using the following steps:

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a. Locate number of spacers required between pulley faces due to belt size (Step 2) on the top of the chart.

b. Look down column located in step A until desired belt spacing dimension is found.

c. In the left hand column, opposite dimension located in step B, find the required number of spacers to be

inserted between pulleys.

EXAMPLE: Belt size 1/2 inch—required spacers between each pulley face: 2. Belt spacing: 1 inch.

Spacers between pulley: 4 (from graph below).

No. of Spacers Between Each Pulley Face No. of Spacers

Between Pulleys

0 5/8 11/16 3/4 13/16 7/8 15/16 1
1 11/16 3/4 13/16 7/8 15/16 1 1-1/16
2 3/4 13/16 7/8 15/16 1 1-1/16 1-1/8
3 13/16 7/8 15/16 1 1-1/16 1-1/8
4 7/8 15/16 1 1-1/16 1-1/8 1-3/16
5 15/16 1 1-1/16 1-1/8 1-3/16
6 1 1-1/16 1-1/8 1-3/16 1-1/4
7 1-1/16 1-1/8 1-3/16 1-1/4
8 1-1/8 1-3/16 1-1/4 1-5/16

9 1-3/16 1-1/4 1-5/16
10 1-1/4 1-5/16 1-3/8
11 1-5/16 1-3/8
12 1-3/8 1-7/16
13 1-7/16
14 1-1/2

0 1 2 3 4 5 6

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Assembling Pulley (Use All Spacers)

1. Assemble extra spacers to hub.

2. Assemble first pulley.

3. Assemble spacers for belt spacing as required.

4. Assemble second pulley (gold pulley is always next to fan).

5. Assemble fan and backing plate, and tighten screws securely.

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C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline [phone]

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